Authorities at the border have discovered a massive tunnel dug by Mexican drug cartels that extends from a Tijuana warehouse to a San Diego industrial building complex.

The tunnel is reported to be more than six football fields in length and includes lighting, ventilation and a railway system.

It is believed the railway was used for smuggling drugs and people right under U.S. officials' noses. Not that such subterfuge is really necessary since the Border Patrol has been ordered by the Obama Administration to effectively stand down and stop enforcing the border.

It's not the first such tunnel discovered. It is one of more than 75 such tunnels found since 2008. And there were others before then.

In Washington, D.C., the City Council and mayor are pushing through a measure that would legalize marijuana possession. Democratic Mayor Vincent Gray announced last month that he supports the bill and he hopes to sign it into law by January.

Drug advocates want the city to go even further by taxing and regulating the drug like Colorado and Washington state have done.

The decriminalization of pot in D.C. began the same way it began elsewhere, with passage of "medical" marijuana laws. In California, such laws have become a bane of police, as major cities such as Los Angeles have seen hundreds of "clinics" pop up overnight to tend to "patients" who have prescriptions but dubious need.

It's clear to anyone with open eyes where these trends are heading: the total decriminalization of pot and eventually the legalizing of other addictive drugs. (Pot users often insist marijuana is not addictive, yet I've noticed that people who say that tend to be long-term, habitual pot smokers.)

The recently found tunnel and others like it are not just symptoms of America's drug addiction, but signs indicating how it happened.

Constructing a tunnel on that scale is a massive undertaking and requires obvious activities, such as dirt hauling, welding, concrete mixing and cable laying that cannot be hidden just by a warehouse roof.

Ask yourself how it is that nobody noticed the construction of 75 tunnels that would put many public works projects to shame. Ask yourself how nobody noticed truckloads of people and mysterious freight pouring out of a building in San Diego.

Then think about the politicians and activists in D.C., Colorado and Washington who have been agitating for years to legally make a profit from illegal activity. Think about the decades of lax border controls and the almost complete absence of border security currently.

The entire situation screams official collusion, at the highest levels. This sort of massive industry is not the undertaking of a few low-level security guards and police officers on the take. Our government, which is supposed to protect us, clearly has been cooperating with the drug runners at various levels.